Perhaps this is a controversial stance but I think if praying is part of your gambling process you probably shouldn’t be gambling maybe.
It depends on someone's belief. If in his/her belief that praying doesn't deserve to include in gambling, it shouldn't be a part of gambling. While if in his/her belief that praying is something usual in the game like gambling, so just go to pray in gambling. Actually, this something shouldn't be debated because basically the choice of an individual. I don't know why many people debate it here although they know it is the right of the individual.